Adding-machine.



W. PLSKINNLER.-

ADDING MACHINE.

APPLIGATIONEILED 00T.25, 1912.

Patented Dc. 2, 1913.

Smm 1.

3 SHEETBw mv 1.555,1; f/ Y A Honig; y,

. W. P VSKINNER. Annul@ Mmmm. I v APPLICATION FILED OOT.25, 1912. l y

1,080,023. Patented Dea. 2, M513,

3 SHEET-SEEET B.

1UNITED STATESWPATENT OFFCE,

WILLIAM P. SKINNER, OF GARDEN CITY, MINNESOTA.

ADDING-MACHINE.

Specification of Letters Patent.

lfatentedlea?,1913.

Application filed October 25, 1912. Serial No. 727,794.

chine by n'ieansof which a eo uinn of nuiii- .hers of any desired length may be readily yand quieklyadded. i i

A further object of my invention is to provide a niaeliine in which the addingl is Caiiied ont in the ordinary nianiier, the units column being first added, then the tens, then the hundreds and so on.

AA further object of 'niy invention is to pro- ,vide an addingl machine 'including a `nnniber carrying indieator plate, a revolving disk also Carrying; numbers, and a second revolving' number disk, the tlrst disk eolae'ting with the plate in the adding of numbers, while the second disk indicates the hundreds.

A further object of iiiy invention is` to provide a simple and etleetive. forni of gearing between the disks whereby the disk indicating the hundreds is interinitten ly driven by the first disk. And a still further object of iny invent-ion is to provide a .loi-k so arranged thatthe hundreds disk an be revolved but once without .tirst releasing@r the lock, the locking of the hundreds disk after one complete revolution also resulting in the looking of the other disk.

lV ith these and other objects iii View, niyl invention will be more fully described, illustrated in the accompanying drawings, and

Ythen speeitieally pointed out in the elainis which are attached to and forni' a part of this application,

In the drawings: lligui'e l is a front elevation of my improved addingr inaohine; Fie: Q is a central -yertieal seetioinof the saine; Fig. 3 is a section on the line of Fig'. 2;

lFiOY 4 is a frainenta'r/ iersieetive view showingl 1the forni RQgear employed in t ansinitting n'ioveinent from one disk to the other.

y Corresponding and like parts are referred to in the followingT description and' indieated in all the views of the drawingS by the The preferred form of iuy invention in bas shown in Fig'. l.

eludes a supporting easing, preferably forined of wood, having a base lt), upwardly and rearwardly extending' front and bark walls ll aud 1Q and side y'alls lll Connect-- ing' the front and bark walls together and to the base. The easing` is further reinforced hy a triangular brace ll seating upon the hase of the easing and bearing against the rear 'all thereof. while the fi'oiit and rear walls are additionally serured by a hracel connecting; said walls at their upper end. i f

The rear wall of the easing is provided with a recess in which is seated a bearing cup 1G carryinga plurality of ball bearings 17 and one end of a shaft ltl is .reduced and beveled as shown at 1S) to seat in the hearing thus formed. The opposite end of this shaft 1S is reduced as shown a 20 and iournaled in the front wall of the easing` with its free end extending` in advance of the saine. frdisk 2l keyed or otherwise secured upon the extended end of the shaft and carries a dial plate Q2 preferably formed of sheet inetal` the peripheral edge of which extends slightlybeyond the edge ofthe disk for a.

reason rwhich will be hereinal'tt" apparent.

A seeond shaft. 2li is similarly iouinaled iii hearings forined .in the front and rear walls 'of the easing` and keyed upon its forwardly extending' end, is a second disk il earryiiilgy a seeond dial plate This dial plate is considerably greater in diameter than its disk in order that it niay overlap the pe i'ipl'ieral edge portion of the dial plate The edge portion of the dial disk 2Q is stainped or iuarked with. a plurality of iiunibei's. the numbers being;- arranged in two eoneentri(I series and the nuiiibers in each of the series being` spaced equally from each other. 'lhe nuiiibei'sl in the inner series, indicated at Q0.` run froiii Zero to 49, while the nuiiibei's in the outer series, indicated at Q7. run in like iiianuer from 50 to 9S). The peripheral edge of the dial disk `which extends beyond the disk 21 is notched iii radial aliiieinent ,with these nuiubers, as shown at .28aiid a pawl :29 pivoted upon the front face of the easing; as shown at engages in the notches thus fornied in the peripheral edge of the disk to lot-k the saine against countereloekwise rotation, thistpawl being maintained in place bya spiiiigil Immediately within the inner ri'rele of 'numbers ,inscribed upon the. disk and in adial alineinent with said numbers, are a lut) plurality of outstanding linger pins by means of which the disk may be rotated in a clockwise direction. The disk'is further provided with a knob 33 which also serves as a means for rotating the saine,

Mounted upon one side of the 'front Wall or" the casing and extending by its inner edge beneath the dial disk is an indicator plate 34 carrying a series of unit numbers arranged concentrically with respect. to the center of the dial disk 22 and adjacent its periphery, these numbers running consecutively from zero to l0. lt will here be noted that the numbers, both upon the disk 22 and the plate 34, are arranged in a counterclockwise direction upon the disk and indicator plate.

Secured upon the Yiront Wall ot the casing with its upper edge coinciding with the zero marking of the indicator plate and extending radially With respect to the dial disk 22, is an arm 35, the free end of which extends over the peripheral edge portion of the disk 22, being cut-away as at 36 to permit the passage of the linger pins Because of this peculiar arrangement of numbers upon 'the dial disk 22 and upon the indicator plate 34, Vit Will be apparent that when the disk 22 is turned to brin any particular number lthereon into ra ial alinement with the zero of the indicator plate, all numbers in the same series lying in radial alinement with the numbers upon the indicator plate will be the sums of the number opposite the Zero of the indicator plate and the alined number on the indicator plate. For instance, the number 85 is shown in radial alinement with the Zero marking of the indicator plate in Fig. l and the number 92 is shown in radial alinement 'with the number '7 of the indicator plate, 92 therefore bcing the sumiol1 the numbers 85 and 7. ln like manner, the number 40 lying in alinement Withl the number 5 of the indicator plate is the sum of 5 and 35 the number lying in alinement with the number zero oi1 the indicator plate and in thc same series Withthe number 40.

It will be apparent that the dial disk 22 may be turned either by means of the finger pins 32 or the, knob 33 to bring any of its numbers in successive alinement with "the Zero of the indicator scale. The linger pins weones plate. The next number in the units column is found upon the indicator plate and the number lying opposite that in the same series of numbers on the dial disk as the first is the sum ot 'the first two numbers as pre viously explained. The -dial disk then rotated to bring the sum thusfound into t alinement with the Zero marking` of the indicator plate and the third unit number located upon the indicator plate and the sum of the lirst three numbers found upon the dial disk, this being repeated until all the unit numbers have been added together, lf the final sum of the unit numbers `is such that a certain number must be'carried when the 'tens are to be added, this number to be carried is used as the first number ot' the tens column and the tens successively added in the manner above described. lt will ot course be apparent that the hundreds and thousands are added in the same way. lin order to temporarily indicate the number of revolutions which the dial disk made during this addingoperation, l have provided the second dial disk previously designated by the numeral and l have further provided a gearing, the construction of which Will be hereinafter e Iplained, -which causes the second dial disk to be rotated through 36 degrees for each complete rotation oi the dial disk 22 or through 72 degrees for every two rotations oi2 the dial disk 22. This dial disk 25 is provided adjacent its peripheral edge with a plurality of spaced apart openings 3i" which, as" the disk 25 is rotated, successively pass over the zero marking of the dial disk 22 exposing the same to view. Stamped or otherwise inscribed. at the side of each ot' these open-- ings, is a number indicated at 38 which indicates the number or' double rotations of the dial disk 22. As the dial disk 22 revolves tWice for each hundred added to the sum, it will be .apparent that this number indicates the hundreds, `vhile the number upon the dial disk adjacent the lastnumber added indicates the tens and units. Marked upon the dial disk 25 adjacent each of these openings 37, but between them and the center of the disk, is a second series kot numbers 39 which indicate the hundreds during the second revolution of the dial disk 22 has 25. rllhese openings, as shown, occur at reg? ular spaced intervals of 72 degrees and a second series of openings '4G are formed in the dial disk 25 also occurring at spaced intervals of 72 degrees. These latter openings are concentrically formed with respect to the dial disk and in position to pass over and expose the numbers upon the outer .zr-ric: of the dial disk 22. Each of these openings i0 lies midway between adjacent openings 37 and may therefore be employed in connection With the openings 37 for indicating the sum added, F or this reason, a number .sary warning to the operator.

designated by the, numeralI 41 is marked upon the dial disk immediately to one side oit eaeh of these openings 40, this number being;r the same as that, atV the side ot' the opening); 37 which immediately precedes it in the eountereloeluvise rotation of disk ln adding; numbers, the snm ot' whieh is at all times below 500, the number of hundreds may be read either from the opening 37 yin alinement between the centers olf the dil disks 22 alinement with said renters, the outer openings 3T iiulieatiimv the hundreds. while the number is between a Certain lnmdred and the same 150. while the inner opening is employed tor reading the number when the number is between a certain 150 and the next hundred. A seeond series of numbers 42 also inseribed upon the dial disk 35, these numbers being' arranged in the Same manner with res-peet to the openings All as are the numbers 3) ot' the openings 3T. These numbersare employed in reading;l the hundreds between 30() and V100()l as also are the numbers of the series 2li),

.ln order that the operator may know when the dial disk 2 has linished one. completo revolution and that he mayI consequently know whether to read the number from one of the series ik? and -lt or from one ot' the series 3S) and 42, l have provided a eateh indira'ted as a whole by the numeral lil. This eateh includes an arm let. extending over the dial disk 25 and provided in its 'inner tare with a slot el?) through whit-h a pin ll carried by the dial disk 25 may pass during;l the turningot' said disk. A tateb plate t7 is pirotally mountedby one end upon the arm ll, as .shown at 48 and in lowered position closes one end ot the slot It5 to prevent the passage ot' the pin therethrough. 'l`his plate is arranged to swing in a plan, at right angles to the front wall o't the easing" and is held against Swinging movenunt in any other plane by slotted emg'aeement with a pin ttl tarried by Vthe urn] -l-l.

Wlan the `dial disk .25 is turned through one complete revolution. thisI pin flt' engages ana-inst theplate'liv to prerent lurther rotat ion nl' the disk until the plate has been manually.. raisetk this eatc'h therefore giving' the neersll -nuxnbersI over a thousand are to be added.y the num ber ot thousands must be set. down on paper or Carried in the head of the operator al` though if deemed advisable a third dial disk ran be provided to eo-atft` with the dial disk 25 to register the thousands.l This however? is hardly deemed neeessary.

liamng thus deseribed the theory ol my improved adding;l inaehine l will now explain *the manner in which the rotation of the dial disk 22 is transmitted tf) the shaft the dial and 25, or from the opening ll in` to intermittently drive the dial disk 2.). This means ineludesI a flange wheel 5u cured upon the shal't 1S and adapted to rotate therewith and a erown gear ,3l similarly secured upon the shaft J8 and ro-aetingij with the flange wheel. rl"he (lange wheel 5() rompriSeS a'disk Shaped body member 52 whirh is secured upon the shaft t8 between jam nutsl 53 which are threaded upon the. shalt to .bear one upon either side of the/body memher and a perlpl'ierally formed laterally eX tending :'llange 54. This flange is provit'led at a point corresponding to thezero 3() mark ing of the disk 22 with an opening 55 and mounted upon a boss 5o lormed in the inner face of thebody member 52, is a finger 5T having' ar beveled terminal 5S extendingy into this opening'.

The crown gear 5l is firmly secured against a shoulder 5t) formed integrally with the sbat't Jil by a Iiam nut titl and is provided with a plurality ot' laterally direeted spared teeth tl. .As best shown in Fig. l ot thedrawings oney ol these teeth en- `ragesl against the inn'er lfaee ot the flange 5l of the llange wlteeh while the adjaeent teeth bear againstV the outer 'laee oli' said tlanee [t will therefore be apparent that the rotation ot' the flange, wheel will 'ne trai'ismitted to the erown gear only when that tooth tt) olf the Crown gear engaging" beneath the flangey of the llangie wheel is engaged by the beveled terminal 5S ol. the linger 5T. XVhen so engaged the Crown `fear is turned to a distante equal to the space between its teeth and the next adjacent tooth broughty into position beneath the flange of the wheel 50. lt will therefore be apparenttluit movement is transmitted to the shaft 2?) but onee during eaeh rotation olf the shaft i8 and that this movement is equal only to the distant'e between adjaeent teeth of the erown `gear. The crown gear is formed with ten teeth in order that the dial disk Q5 may be rotated but Slt?. degrees for eaeh complete rotation ol. described.

lFrom the t'orele'oing deseription, taken in eonneetion with the drawix'le's, the operation of my improved device will be nulily ap parent and no turtxher explanation ol the same is required. It. miehlebe noted however, that the chief Function ot the knob 32% is to permit the ready` rapid and eontinued turning of the dial disk and eonswplently ot the dial disk Q5 to bringv the. parts to original position a'lter the, nulibers have been added. `When so setting tlurlnmlliiu, the disks may be turnedv in either direetion as convenient depeiulinggupon how `large 'the sum previously added is as the pawl itl may be readily swung out of errnagfeinent'y with the disk Z2 to permit its reverse rotation. it desired.

It will ot Course be understood that varithe dial disk as previously ous changes in the details 'of construction, may be made if desired, without in the slightest degree departing from the spirit of my invention.

Having thus described the invention, wha is claimed as new is:

l. An adding machine including a lixed indicator plate, spaced shafts, rotatable dial disks mounted one upon each of said shafts and overlapping each other, and means coacting between the shafts, whereby a comu plete revolution of one shaft will partially revolve the other shaft the numbers of Aone disk being readable through openings formed in the other disk.

2. An adding machine including a revolublc dial plate provided with. concentrically arranged series of scale divisions, the divisions of each scale being consecutively numbered and the numbers of one scale forming a continuation of those of the other, a fixed indicator plate provided with a scale, the numbers of which are in alinement with the divisions of the dial, a second revoluble. dial plate overlapping the first and provided with series of concentrically arranged spaced openings having numbers, the openings of one series exposing a portion of one scale of the rst dial while the openings of the other seriesexpose the other scale of the first dial, and means operable by the rotation of the first dial for intermittently rotating the second dial.

' 8. An adding machine including a fixed indicator plate, spaced shafts, rotatable dial disks mounted one on each of said shafts, means coacting with the shafts whereby a complete revolution of one shaft will par tially revolve the other shaft, an arm extending over the face of one of said' disks and provided in its under face with a channel, a pin carried by said disk and adapted for passage through the channel, and a ,plate'pivoted to the arm and normally eX- icndin across the channel to revent assage of the pin.

4. An adding machine including a fixed indicator plate, spaced shafts, rotatable dial disks mounted one on each of said shafts, means coacting with the shafts whereby a complete revolution of one shaft will partially revolve the other shaft, an arm extending over the face of one ofv said disks WILLIAM P. SKINNER; [Le] VVit-nesses R. G. SMITH, F. It. luiRTLn'rr. 

